Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b48cb8a466ad3c8…

MALICIOUS

PDF

40.3 KB Authoring application: Poppler-utils
MD5: b561384a8be421a7b7695181fc3f2be5 SHA-1: 46b5e7e17b3d0751a329c1095094a84c6b81258e SHA-256: 4b48cb8a466ad3c85a955b60ea32076b172830d4f3ee14f853b8a818bd73e956
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm with multiple URLs pointing to other PDF files, a technique often used for distributing malware. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body, while partially corrupted, contains text related to 'Hba1c normal range chart in hindi', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://a-aon.com/uploads/1/3/0/5/130543648/d9001b2.pdf
    • http://alaskasummerinstitute2020.com/uploads/1/3/0/4/130476079/723862.pdf
    • http://socialmediaflux.com/uploads/1/3/0/4/130489523/64561a94cda670d.pdf
    • http://jamesradack.net/uploads/1/3/0/2/130291545/ba2f72082.pdf
    • http://ndtasanantonio.org/uploads/1/3/0/4/130436306/130436306.html#hba1c+normal+range+chart+in+hindi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000ff2.bin
7b0f04b101fdc201486cc441fcad4f2c784f1d53f7e64b013b5b68b934234ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2 8200 bytes
font_01_sfnt_off00005a14.bin
4411069c16bc3b1ed05e41f2f9afd608bc56a10af727d0017b455dcb62080c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A14 7040 bytes

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